LCL: TTreeView: if custom drawn: let custom drawn decide wether to paint icon, and indent depending on ImageIndex

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41987 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: install packages: set ttreenode imageindex

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41988 4005530d-fff6-0310-9dd1-cebe43e6787f